Aight if we were suspecting mega mawile purely from its strength, might as well just suspect mega medicham first. HJK is far more spammable than both mega garde's hyper voice (she has to predict steels with her unreliable focus blast 24/7) and Mega Heracross's STABs (pigeonholed into rock blast whenever there's a fairy or lando-t on the opposing side basically). There's a good reason we're suspecting mega mawile and its strength isn't the only problem lolAlright, here's the problem.
The great bulk it has, although mediocre in some areas, is over all great. Its typing is damn good offensively and defensively. It has some hard raw power, and not too many things want to be face to face with such a menacing 'mon, especially when it resists most common priority barring one.
With this description. Who am I talking about? Is it clear I'm talking about mega wile? Or could i be talking about quite a few pokemon in the OU tier?
Because the answer is Keldeo.
Let's stop beating around the bush. The only reason this thing is up for this suspect is simply its power. Point blank. Stop trying to justify and just come out and say it hits too hard.
The problem is mega mawile's performance against offense. Sucker Punch allows you to sweep both offensive and defensive teams (well you kinda beat stall anyway) after a boost; THIS is what makes mega mawile so good. In conjunction with her power, yeah we all know that, her ability to beat offensive teams unlike pretty much any other wallbreaker in the tier is what makes her broken.